Damper Actuators. Technical Databook Version 5.1. Belimo Asia Pacific

Transcription

1 Damper Actuators Technical Databook Version 5. Belimo Asia Pacific

2 Damper Actuator standard type naming Product naming e.g. L M U 24 -SR General Damper Actuator 4Nm 2Nm Nm 5Nm 2Nm Mechanical Fail-Safe Damper Actuator 3Nm 2Nm Nm 4Nm 2.5Nm Electronic Fail-Safe Damper Actuator 4Nm General Damper Actuator Mechanical Fail-Safe Damper Actuator Electronic Fail-Safe Damper Actuator G S N L C E S N L T G M F K New Generation General Damper Actuator for Asia Pacific Power supply AC/DC 24V AC...24V (AC 23V for Mechanical Fail-Safe Damper Actuator) Function General Damper Actuator Open/Close, 3-point Modulating DC ()2...V Auxiliary switch Form fit Terminal connection Mechanical Fail-Safe Damper Actuator Open/Close Modulating DC ()2...V 3-point Auxiliary switch Electronic Fail-Safe Damper Actuator 3-point Blank -SR -S -F -T Blank -SR -3 -S,-S2 -MF For customising types of damper actuators, please contact your nearest Belimo sales representative. 2 V Subject to modification

3 Contents V Subject to modification Note: Using Belimo Damper Actuators: The actuators listed in this catalogue are intended for the operation of air dampers in HVAC systems. The damper actuator is not allowed to be used outside the specified field of application, especially in aircraft. The enclosure of the actuator equipment may only be opened by the manufacturer. It contains no components which the user can replace or repair. The device contains electrical and electronic components and is not allowed to be disposed of as household refuse. All locally valid regulations and requirements must be observed. requirements: When calculating the torque required to operate dampers, it is essential to take into account all the data supplied by the damper manufacturer concerning cross sectional area, design, mounting and air flow condition. Product overview General Damper Actuator, 2Nm CMU24(-F8/-F)(-T) CMU24-SR-R CMU23(-F8/-F) General Damper Actuator, 5Nm LMU24(-S/-F/-T) LMU24-SR LMU23(-S/-F) LMU23SR General Damper Actuator, Nm NMU24(-S/-T) NMU24-SR NMU23(-S) NMU23SR General Damper Actuator, 2Nm SMU24(-S) SMU24-SR SMU23(-S/-F) SMU23SR General Damper Actuator, 4Nm GMU24 GMU24-SR GMU23 Fast Running Damper Actuator, 4Nm LMQU24 LMQU24-SR Fast Running Damper Actuator, 8Nm NMQU24 NMQU24-SR Fast Running Damper Actuator, 6Nm SMQU24 SMQU24-SR SMDU23 Mechanical Fail-Safe Damper Actuator, 2.5Nm TF24(-S) TF24-3 TF24-SR TF23(-S) Mechanical Fail-Safe Damper Actuator, 4Nm LF24(-S) LF24-3 LF24-SR LF23(-S) Mechanical Fail-Safe Damper Actuator, Nm NFU NFU-S2 NFU24-SR Mechanical Fail-Safe Damper Actuator, 2Nm SFU SFU-S2 SFU24-SR Mechanical Fail-Safe Damper Actuator, 3Nm EFU24-S2 EFU24-SR EFU23-S2 Electronic Fail-Safe Damper Actuator, 4Nm GKU24 GKU24-MF Mounting instructions Wiring diagrams Auxiliary switch adjustment Electrical accessories Mechanical accessories Replacement table (for Mechanical Fail-Safe Damper Actuators)

4 Damper Actuator product overview 2Nm 5Nm Nm 2Nm 4Nm General Damper Actuator CMU.. LMU.. NMU.. SMU.. GMU.. Open/Close, 3-point AC/DC 24V 5/6Hz CMU24(-F8/-F)(-T) LMU24(-F/-T) NMU24(-T) SMU24 GMU24* Auxiliary switch built-in SPDT LMU24-S NMU24-S SMU24-S AC...24V 5/6Hz CMU23(-F8/-F) LMU23 NMU23 SMU23 GMU23* Auxiliary switch built-in SPDT LMU23-S NMU23-S SMU23-S Modulating Control signal DC ()2...V, feedback DC 2...V AC/DC 24V 5/6Hz CMU24-SR-R** LMU24-SR NMU24-SR SMU24-SR GMU24-SR AC...24V 5/6Hz LMU23SR NMU23SR SMU23SR Running time 75s 5s Shaft diameter mm 6...2mm mm...2mm mm Sound power level Max. 35dB(A) Max. 45dB(A) Manual override Gear disengaging by magnet Gear disengaging by push button Electrical connection Cable m (-T: Terminal) Direction of rotation Selected by switch Max. 95, can be limited at both ends with mechanical adjustable end stops Mechanical, plug-on (-T: IP2) CE according to 89/336/EEC LVD*** CE according to 73/23/EEC Ambient temperature C Non-operation temperature * Only Open/Close, no 3-point. ** CMU24-SR-R: Control signal ()2V at the right side, and the left side is available on request. *** For 23V models. 4 4Nm 8Nm 6Nm General Damper Actuator LMQU.. NMQU.. SMQU.. SMDU.. Open/Close AC 24V 5/6Hz, DC 24V LMQU24 NMQU24 SMQU24 AC...24V 5/6Hz SMDU23 Modulating Control signal DC ()2...V, feedback DC 2...V AC 24V 5/6Hz, DC 24V LMQU24-SR NMQU24-SR SMQU24-SR Running time 2.5s 4s 7s 2s Shaft diameter mm mm...2mm Sound power level Max. 52dB(A) Max. 55dB(A) Manual override Disengaging the gearing latch by means of a push button, self-resetting Electrical connection Cable m Direction of rotation Selected by switch Max. 95, can be limited at both ends with mechanical adjustable end stops Mechanical, plug-on CE according to 24/8/EC LVD* CE according to 26/95/EC Ambient temperature C (without restrictions); C (with restrictions) Non-operation temperature C * For 23V models. V Subject to modification

5 Damper Actuator product overview 2.5Nm 4Nm Mechanical Fail-Safe Damper Actuator TF.. LF.. Open/Close AC/DC 24V 5/6Hz TF24 LF24 Auxiliary switch built-in SPDT TF24-S LF24-S AC 23V 5/6Hz TF23** LF23 Auxiliary switch built-in SPDT TF23-S LF23-S 3-point AC/DC 24V 5/6Hz Modulating Control signal DC ()2...V, feedback DC 2...V TF24-3** LF24-3 AC/DC 24V 5/6Hz TF24-SR LF24-SR Running time -Motor -Spring return <75s* <25s 4-75s* <2s Shaft diameter 6...2mm 8...6mm Sound power level -Motor Open/Close max. 5dB(A) Modulating and 3-point max. 35dB(A) -Spring Electrical connection Direction of rotation Open/Close max. 5dB(A) Modulating and 3-point max. 3dB(A) 62dB(A) Cable m Selected by mounting L/R Max. 95 Mechanical end stops Yes Yes IP42 CE according to 89/336/EEC LVD*** CE according to 73/23/EEC Ambient temperature C Non-operation temperature * LF24-3 and all -SR types are 5s. ** TF24-3 nominal voltage is AC 24V, TF23 nominal voltage is AC...24V. *** For 23V models. V Subject to modification 5

6 Damper Actuator product overview Nm 2Nm 3Nm Mechanical Fail-Safe Damper Actuator NFU.. SFU.. EFU.. Open/Close AC V / DC V NFU SFU - Auxiliary switch built-in 2 SPDT NFU-S2 SFU-S2 - AC/DC 24V 5/6Hz Auxiliary switch built-in 2 SPDT - - EFU24-S2 AC 23V 5/6Hz Auxiliary switch built-in 2 SPDT - - EFU23-S2 Modulating Control signal DC ()2...V, feedback DC 2...V AC/DC 24V 5/6Hz NFU24-SR SFU24-SR EFU24-SR Running time -Motor -Spring return Open/Close 75s; modulating 5s C / max. 3 C Open/Close 6s; modulating 5s C / max. 3 C Shaft diameter / mm / mm mm / mm Sound power level -Motor -Spring return Open/Close max. 45dB(A) Modulating max. 4dB(A) max. 62dB(A) Open/Close max. 55dB(A) Modulating max. 45dB(A) max. 7dB(A) Electrical connection Cable m Direction of rotation Selected by mounting L/R Max. 95 Mechanical end stops Yes Yes CE according to 89/336/EEC LVD* CE according to 26/95/EC Ambient temperature C Non-operation temperature * For 23V only. 4Nm Electronic Fail-Safe Damper Actuator GKU.. Open/Close AC/DC 24V 5/6Hz GKU24 - Modulating / 3-point Control signal DC ()2...V, feedback DC 2...V AC/DC 24V 5/6Hz - GKU24-MF Running time -Standard -Power off position 5s 35s 9...5s 35s Shaft diameter / mm / mm Sound power level -Standard -Power off position Electrical connection Direction of rotation 6 Max. 53dB(A) Max. 6dB(A) Cable m Selected by mounting L/R Max. 95 Mechanical end stops Yes Yes CE according to 24/8/EC Ambient temperature C Non-operation temperature V Subject to modification

7 CMU24(-F8/-F)(-T) For operation of air control dampers in HVAC system : : Control: 2Nm AC/DC 24V Open/Close or 3-point range For transformer sizing Connection (-T) cable Direction of rotation Manual override no limiters with limiters Running time Sound power level AC 24V 5/6Hz, DC 24V AC/DC nominal torque holding VA Terminals for 3x.5mm 2 CU wire or 3x.mm 2 CU litz wires m, 3x.75mm 2 nominal voltage Depends on electrical installation Gear disengagement by magnet Endless Fixed 35 or with mechanical end stops, can be adjusted in 2.5 increments 75s Max. 35dB(A) Mechanical, pluggable with integrated magnet for gear disengagement III (safety extra-low voltage) (-T) IP2 cable CE according to 89/336/EEC Mode of operation Type (EN 673-) Shaft Form fit (-F8) (-F) C -free mm 8x8mm xmm kg CMU24 CMU24-T CMU24-F8-T V Subject to modification

8 CMU24-SR-R For operation of air control dampers in HVAC system : : Control signal: Position feedback: 2Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque holding For transformer sizing 2VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC()2 input impedance kω Position feedback signal U DC 2 max. ma Position accuracy ±5% Direction of rotation Y=V at right end stop position Manual override Gear disengagement by magnet Max. 95º, adjustable by mechanical stops Running time 75s Sound power level Max. 35dB(A) Mechanical, pluggable with integrated magnet for gear disengagement III (safety extra-low voltage) CE according to 89/336/EEC Mode of operation Type (EN 673-) C -free Shaft mm.22kg * -R: Control signal ()2V at right side V Subject to modification

9 CMU23(-F8/-F) For operation of air control dampers in HVAC system : : Control: 2Nm AC...24V Open/Close or 3-point AC...24V 5/6Hz range AC nominal torque / holding For transformer sizing 3VA Connecting cable Cable m, 3x.75mm 2 nominal voltage Direction of rotation Depends on electrical installation Manual override Gear disengagement by magnet no limiters with limiters Running time Sound power level Low voltage directive Mode of operation Type (EN 673-) Shaft Form fit (-F8) (-F) Endless Fixed 35 or with mechanical end stops, can be adjusted in 2.5 increments 75s Max. 35dB(A) Mechanical, pluggable with integrated magnet for gear disengagement II (Totally insulated) CE according to 24/8/EC CE according to 26/95/EC C -free mm 8x8mm xmm.22kg CMU23 CMU23-F V Subject to modification

10 LMU24(-S/-F/-T) For operation of air control dampers in HVAC system : : Control: 5Nm AC/DC 24V Open/Close or 3-point range For transformer sizing Auxiliary switch (-S) Connection -motor -auxiliary switch (-S) -terminals (-T) AC 24V 5/6Hz, DC 24V AC/DC V nominal torque holding.5va SPDT, ma...3(.5)a, AC 25V, adjustable Cable m, 3x.75mm 2 Cable m, 3x.75mm 2 Max. 3x.5mm 2 nominal voltage Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95, adjustable by mechanical stops Running time 5s Sound power level Max. 35dB(A) Mechanical, remote visible III (safety extra-low voltage) LMU24(-S/-F) LMU24-T IP2 CE according to 89/336/EEC Mode of operation Type (EN 673-) Shaft length Shaft LMU24(-S/-T) LMU24-F C -free Min. 37mm 6...2mm 8x8mm.5kg V Subject to modification

11 LMU24-SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: 5Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque holding For transformer sizing 2VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max. ma Position accuracy ±5% Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 5s Sound power level Max. 35dB(A) Mechanical, remote visible III (safety extra-low voltage) CE according to 89/336/EEC Mode of operation Type (EN 673-) C -free Shaft 6...2mm.5kg V Subject to modification

12 LMU23(-S/-F) For operation of air control dampers in HVAC system : : Control: 5Nm AC...24V Open/Close or 3-point range For transformer sizing Auxiliary switch (-S) Connection -motor -auxiliary switch (-S) AC...24V 5/6Hz AC nominal torque holding 3.5VA SPDT, ma...3(.5)a, AC 25V, adjustable Cable m, 3x.75mm 2 Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95, adjustable by mechanical stops Running time 5s Sound power level Max. 35dB(A) Mechanical, remote visible II (Totally insulated) Low voltage directive CE according to 89/336/EEC CE according to 73/23/EEC Mode of operation Type (EN 673-) Shaft length Shaft LMU23(-S) LMU23-F C -free Min. 37mm 6...2mm 8x8mm.55kg LMU23(-S) LMU23-F V Subject to modification

13 LMU23SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: 5Nm AC...24V DC ()2...V DC 2...V range For transformer sizing Connecting cable -power supply -signal AC...24V 5/6Hz AC V nominal torque / holding 4VA Cable m, 2x.75mm 2 Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max. ma Position accuracy ±5% Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 5s Sound power level Max. 35dB(A) Mechanical, remote visible II (Totally insulated) Low voltage directive CE according to 89/336/EEC CE according to 73/23/EEC Mode of operation Type (EN 673-) C -free Shaft 6...2mm.7kg V Subject to modification

14 NMU24(-S/-T) For operation of air control dampers in HVAC system : : Control: Nm AC/DC 24V Open/Close or 3-point range For transformer sizing Auxiliary switch (-S) Connection -motor -auxiliary switch (-S) -terminals (-T) Direction of rotation Manual override Running time Sound power level NMU24(-S) NMU24-T AC 24V 5/6Hz, DC 24V AC/DC nominal torque holding 3.5VA SPDT, ma...3(.5)a, AC 25V, adjustable Cable m, 3x.75mm 2 Cable m, 3x.75mm 2 Max. 3x.5mm 2 nominal voltage Selectable by switch Gearing latch disengaged by push button, self-resetting Max. 95, adjustable by mechanical stops 5s Max. 35dB(A) Mechanical, remote visible III (safety extra-low voltage) IP2 CE according to 89/336/EEC Mode of operation Type (EN 673-) C -free Shaft length Min. 4mm (2mm with K-NA for reverse mounting-optional) Shaft mm (8...2mm with K-NA).75kg NMU24(-S) NMU24-T V Subject to modification

15 NMU24-SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque holding For transformer sizing 4VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max. ma Position accuracy ±5% Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 5s Sound power level Max. 35dB(A) Mechanical, remote visible III (safety extra-low voltage) CE according to 89/336/EEC Mode of operation Type (EN 673-) C -free Shaft mm (8...2mm with K-NA).8kg V Subject to modification

16 NMU23(-S) For operation of air control dampers in HVAC system : : Control: Nm AC...24V Open/Close or 3-point range For transformer sizing Auxiliary switch (-S) Connection -motor -auxiliary switch (-S) AC...24V 5/6Hz AC V nominal torque holding 5.5VA SPDT, ma...3(.5)a, AC 25V, adjustable Cable m, 3x.75mm 2 Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95, adjustable by mechanical stops Running time 5s Sound power level Max. 35dB(A) Mechanical, remote visible II (Totally insulated) Low voltage directive CE according to 89/336/EEC CE according to 73/23/EEC Mode of operation Type (EN 673-) Shaft length Shaft C -free Min. 4mm (2mm with K-NA for reverse mounting-optional) mm (8...2mm with K-NA).8kg V Subject to modification

17 NMU23SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: Nm AC...24V DC ()2...V DC 2...V range For transformer sizing Connection -power supply -signal AC...24V 5/6Hz AC V nominal torque / holding 6.5VA Cable m, 2x.75mm 2 Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max. ma Position accuracy ±5% Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 5s Sound power level Max. 35dB(A) Mechanical, remote visible II (Totally insulated) Low voltage directive CE according to 89/336/EEC CE according to 73/23/EEC Mode of operation Type (EN 673-) Shaft length C -free Min. 4mm (2mm with K-NA for reverse mounting-optional) Shaft mm (8...2mm with K-NA).95kg V Subject to modification

18 SMU24(-S) For operation of air control dampers in HVAC system : : Control: 2Nm AC/DC 24V Open/Close or 3-point AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque holding For transformer sizing 4VA Auxiliary switch (-S) SPDT, ma...3(.5)a, AC 25V, adjustable Connection -motor -auxiliary switch (-S) Cable m, 3x.75mm 2 Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95, adjustable by mechanical stops Running time 5s Sound power level Max. 45dB(A) Mechanical, remote visible III (safety extra-low voltage) CE according to 89/336/EEC Mode of operation Type (EN 673-) Shaft length C -free Min. 42mm (2mm for reverse mounting) Shaft..2mm ( mm with K-ENSA - optional).5kg V Subject to modification

19 SMU24-SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: 2Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque holding For transformer sizing 4VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max. ma Position accuracy ±5% Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 5s Sound power level Max. 45dB(A) Mechanical, remote visible III (safety extra-low voltage) CE according to 89/336/EEC Mode of operation Type (EN 673-) Shaft length C -free Min. 42mm (2mm for reverse mounting) Shaft..2mm ( mm with K-ENSA - optional).5kg V Subject to modification

20 SMU23(-S/-F) For operation of air control dampers in HVAC system : : Control: 2Nm AC...24V Open/Close or 3-point range For transformer sizing Auxiliary switch (-S) Connection -motor -auxiliary switch (-S) AC...24V 5/6Hz AC V nominal torque holding 6VA SPDT, ma...3(.5)a, AC 25V, adjustable Cable m, 3x.75mm 2 Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95, adjustable by mechanical stops Running time 5s Sound power level Max. 45dB(A) Mechanical, remote visible II (Totally insulated) Low voltage directive CE according to 89/336/EEC CE according to 73/23/EEC Mode of operation Type (EN 673-) Shaft length Shaft SMU23(-S) SMU23-F C -free Min. 42mm (2mm for reverse mounting)..2mm ( mm with K-ENSA-optional) 2x2mm.5kg SMU23-F SMU23(-S) V Subject to modification

21 SMU23SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: 2Nm AC...24V DC ()2...V DC 2...V range For transformer sizing Connection -power supply -signal AC...24V 5/6Hz AC V nominal torque / holding 6.5VA Cable m, 2x.75mm 2 Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max. ma Position accuracy ±5% Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 5s Sound power level Max. 45dB(A) Mechanical, remote visible II (Totally insulated) Low voltage directive CE according to 89/336/EEC CE according to 73/23/EEC Mode of operation Type (EN 673-) Shaft length C -free Min. 42mm (2mm for reverse mounting) Shaft..2mm ( mm with K-ENSA-optional).2kg V Subject to modification

22 GMU24 For operation of air control dampers in HVAC system : : Control: 4Nm AC/DC 24V Open/Close AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque / holding For transformer sizing 6VA Connecting cable Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95, adjustable by mechanical stops Running time 5s Sound power level Max. 45dB(A) Mechanical, remote visible III (safety extra-low voltage) CE according to 89/336/EEC Mode of operation Type (EN 673-) Shaft length C -free Min. 52mm (2mm for reverse mounting) Shaft mm / mm.7kg Standard : Damper spindle Length >52 > >2 < >2 < mm 2...8mm mm 2...8mm V Subject to modification

23 GMU24-SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: 4Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque / holding For transformer sizing 6.5VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max. ma Position accuracy ±5% Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 5s Sound power level Max. 45dB(A) Mechanical, remote visible III (safety extra-low voltage) CE according to 89/336/EEC Mode of operation Type (EN 673-) Shaft length C -free Min. 52mm (2mm for reverse mounting) Shaft mm / mm.7kg Standard : Damper spindle Length >52 > >2 < >2 < V Subject to modification mm mm 2...8mm 2...8mm

24 GMU23 For operation of air control dampers in HVAC system : : Control: 4Nm AC...24V Open/Close AC...24V 5/6Hz range AC V nominal torque / holding For transformer sizing 9VA Connecting cable Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by switch Manual override Gearing latch disengaged by push button, self-resetting Max. 95, adjustable by mechanical stops Running time 5s Sound power level Max. 45dB(A) Mechanical, remote visible II (Totally insulated) Low voltage directive CE according to 89/336/EEC CE according to 73/23/EEC Mode of operation Type (EN 673-) Shaft length C -free Min. 52mm (2mm for reverse mounting) Shaft mm / mm.7kg Standard : Damper spindle Length >52 > >2 < >2 < mm 2...8mm mm 2...8mm V Subject to modification

25 LMQU24 For operation of air control dampers in HVAC system : : Control: 4Nm AC/DC 24V Open/Close (not made for 3-point applications) range For transformer sizing AC 24V 5/6Hz, DC 24V AC V / DC V nominal torque holding 23VA (Imax. 5ms) Connecting cable Cable m, 3x.75mm 2 nominal voltage Direction of rotation Reversible with switch or Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 2.5s Automatic adjustment of operating range to match the mechanical angle of rotation Sound power level Negative torque! Manual triggering of the adaption by pressing the «Adaption» button Max. 52dB(A) Mechanical, remote visible 5% from nominal torque (with restrictions) III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type (EN 673-) C (without restrictions)! C (with restrictions) -free.85kg V Subject to modification Damper spindle Length * * Option (accessory K-NA)

26 LMQU24-SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: 4Nm AC/DC 24V DC ()2...V DC 2...V range For transformer sizing AC 24V 5/6Hz, DC 24V AC V / DC V nominal torque holding 23VA (Imax. 5ms) Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC max..5ma Position accuracy ±5% Direction of rotation Reversible with switch or Direction of motion at Y=V At switch position resp. Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 2.5s Automatic adjustment of operating range and measuring signal U to match the mechanical angle of rotation Manual triggering of the adaption by pressing the «Adaption» button Sound power level Max. 52dB(A) Mechanical, remote visible Negative torque! 5% from nominal torque (with restrictions) III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type (EN 673-)! C (without restrictions) C (with restrictions) -free.85kg Damper spindle Length * * Option (accessory K-NA) V Subject to modification

27 NMQU24 For operation of air control dampers in HVAC system : : Control: 8Nm AC/DC 24V Open/Close (not made for 3-point applications) AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque holding For transformer sizing 23VA (Imax. 5ms) Connecting cable Cable m, 3x.75mm 2 nominal voltage Direction of rotation Reversible with switch or Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 4s Automatic adjustment of operating range to match the mechanical angle of rotation Sound power level Negative torque! Manual triggering of the adaption by pressing the «Adaption» button Max. 52dB(A) Mechanical, remote visible 5% from nominal torque (with restrictions) III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type (EN 673-) C (without restrictions)! C (with restrictions) -free.97kg V Subject to modification Damper spindle Length * * Option (accessory K-SA)

28 NMQU24-SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: 8Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque holding For transformer sizing 23VA (Imax. 5ms) Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC max..5ma Position accuracy ±5% Direction of rotation Reversible with switch or Direction of motion at Y=V At switch position resp. Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 4s Automatic adjustment of operating range and measuring signal U to match the mechanical angle of rotation Manual triggering of the adaption by pressing the «Adaption» button Sound power level Max. 52dB(A) Mechanical, remote visible Negative torque! 5% from nominal torque (with restrictions) III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type (EN 673-)! C (without restrictions) C (with restrictions) -free.95kg Damper spindle Length * * Option (accessory K-SA) V Subject to modification

29 SMQU24 For operation of air control dampers in HVAC system : : Control: 6Nm AC/DC 24V Open/Close (not made for 3-point applications) AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque holding For transformer sizing 26VA (Imax. 5ms) Connecting cable Cable m, 3x.75mm 2 nominal voltage Direction of rotation Reversible with switch or Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 7s Automatic adjustment of operating range to match the mechanical angle of rotation Sound power level Negative torque! Manual triggering of the adaption by pressing the «Adaption» button Max. 52dB(A) Mechanical, remote visible 5% from nominal torque (with restrictions) III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type (EN 673-) C (without restrictions)! C (with restrictions) -free.7kg 83 Damper spindle Length V Subject to modification mm mm 2...8mm 2...8mm

30 SMQU24-SR For operation of air control dampers in HVAC system : : Control signal: Position feedback: 6Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC/DC V nominal torque holding For transformer sizing 26VA (Imax. 5ms) Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC max..5ma Position accuracy ±5% Direction of rotation Reversible with switch or Direction of motion at Y=V At switch position resp. Manual override Gearing latch disengaged by push button, self-resetting Max. 95º, adjustable by mechanical stops Running time 7s Automatic adjustment of operating range and measuring signal U to match the mechanical angle of rotation Manual triggering of the adaption by pressing the «Adaption» button Sound power level Max. 52dB(A) Mechanical, remote visible Negative torque! 5% from nominal torque (with restrictions) III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type (EN 673-)! C (without restrictions) C (with restrictions) -free.7kg Damper spindle Length mm mm 2...8mm 2...8mm V Subject to modification

31 SMDU23 For operation of air control dampers in HVAC system : Running time : Control: 6Nm 2s AC...24V Open/Close or 3-point AC...24V 5/6Hz range AC V nominal torque / holding For transformer sizing 8VA Connecting cable Cable m, 3x.75mm 2 nominal voltage Direction of rotation Reversible with switch resp. Manual override Gearing disengaged by pressing the push button, can be locked Max. 95º, can be limited with adjustable mechanical end stops Running time 2s Sound power level Max. 55dB(A) Mechanical, remote visible II (Totally insulated) Low voltage directive Mode of operation Rated impulse voltage CE according to 24/8/EC CE according to 26/95/EC Type (EN673-) 4kV Control pollution degree C -free kg 64 Damper spindle Length... 2 )... 2 ) 56 ) CrNi (INOX) V Subject to modification

32 Mechanical Fail-Safe Damper Actuator TF24(-S) For operation of air control dampers that perform safety function : : Control: 2.5Nm AC/DC 24V Open/Close Integrated auxiliary switch (TF24-S) AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque holding For transformer sizing 5VA Auxiliary switch (-S) SPDT, ma...3(.5)a, AC 25V, adjustable Connecting cable -motor -auxiliary switch (-S) Cable m, 2x.75mm 2 Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Max. 95º, 37...% adjustable by mechanical stops Running time -motor -spring return 75s C / max. -3 C Sound power level -motor -spring return Max. 5dB(A) Max. 62dB(A) Mechanical III (safety extra-low voltage) IP42 CE according to 89/336/EEC Mode of operation Type.AA (EN 673-) Shaft length Clamp up Clamp down C -free Min. 84mm Min. 2mm Shaft 6...2mm.6kg V Subject to modification

33 Mechanical Fail-Safe Damper Actuator TF24-3 For operation of air control dampers that perform safety function : : Control: 2.5Nm AC 24V 3-point AC 24V 5/6Hz range AC V nominal torque / holding For transformer sizing 4VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Max. 95º, 37...% adjustable by mechanical stops Running time -motor -spring return 5s C / max. -3 C Sound power level -motor -spring return Max. 35dB(A) Max. 62dB(A) Mechanical III (safety extra-low voltage) IP42 CE according to 89/336/EEC Mode of operation Type.AA (EN 673-) Shaft length Clamp up Clamp down C -free Min. 84mm Min. 2mm Shaft 6...2mm.6kg V Subject to modification

34 Mechanical Fail-Safe Damper Actuator TF24-SR For operation of air control dampers that perform safety function : : Control signal: Position feedback: 2.5Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque / holding For transformer sizing 4VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max..5ma Direction of rotation Selectable by mounting L/R Max. 95º, 37...% adjustable by mechanical stops Running time -motor -spring return 5s C / max. -3 C Sound power level -motor -spring return Max. 35dB(A) Max. 62dB(A) Mechanical III (safety extra-low voltage) IP42 CE according to 89/336/EEC Mode of operation Type.AA (EN 673-) Shaft length Clamp up Clamp down C -free Min. 84mm Min. 2mm Shaft 6...2mm.6kg V Subject to modification

35 Mechanical Fail-Safe Damper Actuator TF23(-S) For operation of air control dampers that perform safety function : : Control: 2.5Nm AC...24V Open/Close Integrated auxiliary switch (TF23-S) AC...24V 5/6Hz range AC V nominal torque holding For transformer sizing 5VA Auxiliary switch (-S) SPDT, ma...3(.5)a, AC 25V, adjustable Connecting cable -motor -auxiliary switch (-S) Cable m, 2x.75mm 2 Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Max. 95º, 37...% adjustable by mechanical stops Running time -motor -spring return 75s C / max. -3 C Sound power level -motor -spring return Max. 5dB(A) Max. 62dB(A) Mechanical II (Totally insulated) IP42 Low voltage directive CE according to 89/336/EEC CE according to 73/23/EEC Mode of operation Type.AA (EN 673-) Shaft length Clamp up Clamp down C -free Min. 84mm Min. 2mm Shaft 6...2mm.6kg V Subject to modification

36 6. 8. Mechanical Fail-Safe Damper Actuator LF24(-S) For operation of air control dampers that perform safety function : : Control: 4Nm AC/DC 24V Open/Close Integrated auxiliary switch (LF24-S) AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque / holding For transformer sizing 7VA Auxiliary switch (-S) SPDT, ma...3(.5)a, AC 25V, adjustable Connecting cable -motor -auxiliary switch (-S) Cable m, 2x.75mm 2 Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Max. 95º, 37...% adjustable by mechanical stops Running time -motor -spring return s C / max. -3 C Sound power level -motor -spring return Max. 5dB(A) Max. 62dB(A) Mechanical III (safety extra-low voltage) CE according to 24/8/EC C -free Shaft length Clamp up Clamp down Min. 84mm Min. 2mm Shaft 8...6mm.4kg V Subject to modification

37 Mechanical Fail-Safe Damper Actuator LF24-3 For operation of air control dampers that perform safety function : : Control: 4Nm AC/DC 24V 3-point AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque / holding For transformer sizing 5VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Max. 95º, 37...% adjustable by mechanical stops Running time -motor -spring return 5s C / max. -3 C Sound power level -motor -spring return Shaft length Clamp up Clamp down Max. 3dB(A) Max. 62dB(A) Mechanical III (safety extra-low voltage) CE according to 24/8/EC C -free Min. 84mm Min. 2mm Shaft 8...6mm.4kg V Subject to modification

38 Mechanical Fail-Safe Damper Actuator LF24-SR For operation of air control dampers that perform safety function : : Control signal: Position feedback: 4Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque / holding For transformer sizing 5VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max..7ma Direction of rotation Selectable by L/R switch Selectable by L/R mounting Max. 95º, 37...% adjustable by mechanical stops Running time -motor -spring return 5s C / max. -3 C Sound power level -motor -spring return Max. 3dB(A) Max. 62dB(A) Mechanical III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type.AA (EN 673-) Shaft length Clamp up Clamp down C -free Min. 84mm Min. 2mm Shaft 8...6mm.4kg V Subject to modification

39 Mechanical Fail-Safe Damper Actuator LF23(-S) For operation of air control dampers that perform safety function : : Control: 4Nm AC 23V Open/Close Integrated auxiliary switch (LF23-S) AC 23V 5/6Hz range AC V nominal torque / holding For transformer sizing 7VA Auxiliary switch (-S) SPDT, ma...3(.5)a, AC 25V, adjustable Connecting cable -motor -auxiliary switch (-S) Cable m, 2x.75mm 2 Cable m, 3x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Max. 95º, 37...% adjustable by mechanical stops Running time -motor -spring return s C / max. -3 C Sound power level -motor -spring return Max. 5dB(A) Max. 62dB(A) Mechanical II (Totally insulated) Low voltage directive CE according to 24/8/EC CE according to 26/95/EC C -free Shaft length Clamp up Clamp down Min. 84mm Min. 2mm Shaft 8...6mm.55kg V Subject to modification

40 2-FRONT Mechanical Fail-Safe Damper Actuator NFU Damper actuator for operating air control dampers in ventilation and air-conditioning systems for building services installations : : Control: Nm AC V / DC V Open/Close AC V 5/6Hz, DC V range AC V / DC V nominal torque / holding For transformer sizing AC 24V; AC 2V; AC 24V Connecting cable Cable m, 2x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Manual override By manual override key Max. 95º, adjustable by mechanical stops Running time -motor -spring return 75s C / max. -3 C Sound power level -motor -spring return Low voltage directive Max. 45dB(A) Max. 62dB(A) Mechanical II (Totally insulated) CE according to 24/8/EC CE according to 26/95/EC Mode of operation Type.AA (EN 673-) C -free 2kg Standard : ¾ - clamp (with insert) Damper shaft Length Optional : - clamp (without insert) 49 5 Damper shaft Length Optional 2: ½ - clamp (optional via configuration) Damper shaft Length V Subject to modification

41 2-FRONT Mechanical Fail-Safe Damper Actuator NFU-S2 Damper actuator for operating air control dampers in ventilation and air-conditioning systems for building services installations : : Control: Nm AC V / DC V Open/Close 2xSPDT auxiliary switches range For transformer sizing Auxiliary switch (-S2) Connecting cable -motor -auxiliary switch (-S2) AC V 5/6Hz, DC V AC V / DC V nominal torque / holding AC 24V; AC 2V; AC 24V 2 SPDT, ma...3(.5)a, AC 25V one fixed at %, one adjustable...9% Cable m, 2x.75mm 2 Cable m, 6x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Manual override By manual override key Max. 95º, adjustable by mechanical stops Running time -motor -spring return 75s C / max. -3 C Sound power level -motor -spring return Max. 45dB(A) Max. 62dB(A) Mechanical II (Totally insulated) Low voltage directive CE according to 24/8/EC CE according to 26/95/EC Mode of operation Type.AA.B (EN 673-) C -free 2.2kg Standard : ¾ - clamp (with insert) Damper shaft Length Optional : - clamp (without insert) 49 5 V Subject to modification Damper shaft Length Optional 2: ½ - clamp (optional via configuration) Damper shaft Length

42 2-FRONT Mechanical Fail-Safe Damper Actuator NFU24-SR Damper actuator for operating air control dampers in ventilation and air-conditioning systems for building services installations : : Control signal: Position feedback: Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque / holding For transformer sizing 6VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC 2 max..5ma Position accuracy ±5% Direction of rotation Reversible with switch / Selectable by mounting L/R Manual override By manual override key Max. 95º, adjustable by mechanical stops Running time -motor -spring return 5s C / max. -3 C Sound power level -motor -spring return Max. 4dB(A) Max. 62dB(A) Mechanical III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type.AA (EN 673-) C -free 2kg Standard : ¾ - clamp (with insert) Damper shaft Length Optional : - clamp (without insert) Damper shaft Length Optional 2: ½ - clamp (optional via configuration) Damper shaft Length V Subject to modification

43 2-FRONT Mechanical Fail-Safe Damper Actuator SFU Damper actuator for operating air control dampers in ventilation and air-conditioning systems for building services installations : : Control: 2Nm AC V / DC V Open/Close AC V 5/6Hz, DC V range AC V / DC V nominal torque / holding For transformer sizing AC 24V; AC 2V; AC 24V Connecting cable Cable m, 2x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Manual override By manual override key Max. 95º, adjustable by mechanical stops Running time -motor -spring return 75s C / max. -3 C Sound power level -motor -spring return Low voltage directive Max. 45dB(A) Max. 62dB(A) Mechanical II (Totally insulated) CE according to 24/8/EC CE according to 26/95/EC Mode of operation Type.AA (EN 673-) C -free 2.2kg Standard : ¾ - clamp (with insert) Damper shaft Length Optional : - clamp (without insert) 49 5 Damper shaft Length V Subject to modification Optional 2: ½ - clamp (optional via configuration) Damper shaft Length

44 2-FRONT Mechanical Fail-Safe Damper Actuator SFU-S2 Damper actuator for operating air control dampers in ventilation and air-conditioning systems for building services installations : 2Nm : AC V / DC V Control: Open/Close 2xSPDT auxiliary switches range For transformer sizing Auxiliary switch (-S2) Connecting cable-motor -auxiliary switch (-S2) AC V 5/6Hz, DC V AC V / DC V nominal torque / holding AC 24V; AC 2V; AC 24V 2 SPDT, ma...3(.5)a, AC 25V one fixed at %, one adjustable...9% Cable m, 2x.75mm 2 Cable m, 6x.75mm 2 nominal voltage Direction of rotation Selectable by mounting L/R Manual override By manual override key Max. 95º, adjustable by mechanical stops Running time -motor -spring return 75s C / max. -3 C Sound power level -motor -spring return Max. 45dB(A) Max. 62dB(A) Mechanical II (Totally insulated) Low voltage directive CE according to 24/8/EC CE according to 26/95/EC Mode of operation Type.AA.B (EN 673-) C -free 2.4kg Standard : ¾ - clamp (with insert) Damper shaft Length Optional : - clamp (without insert) Damper shaft Length Optional 2: ½ - clamp (optional via configuration) Damper shaft Length V Subject to modification

45 2-FRONT Mechanical Fail-Safe Damper Actuator SFU24-SR Damper actuator for operating air control dampers in ventilation and air-conditioning systems for building services installations : : Control signal: Position feedback 2Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque / holding For transformer sizing 7VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC max..5ma Position accuracy ±5% Direction of rotation Reversible with switch / Selectable by mounting L/R Manual override By manual override key Max. 95º, adjustable by mechanical stops Running time -motor -spring return 75s C / max. -3 C Sound power level -motor -spring return Max. 4dB(A) Max. 62dB(A) Mechanical III (safety extra-low voltage) CE according to 24/8/EC Mode of operation Type.AA (EN 673-) C -free 2.2kg Standard : ¾ - clamp (with insert) Damper shaft Length Optional : - clamp (without insert) 49 5 V Subject to modification Damper shaft Length Optional 2: ½ - clamp (optional via configuration) Damper shaft Length

46 Mechanical Fail-Safe Damper Actuator EFU24-S2 Mechanical Fail-Safe Actuator with emergency function for adjusting air dampers in ventilation and air conditioning systems in buildings. : : Control: 2xSPDT auxiliary switches 3Nm AC/DC 24V Open/Close AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque / holding For transformer sizing 6VA Auxiliary switch (-S2) 2xSPDT, ma...3(.5)a, AC 25V one fixed at %, one adjustable...9% Connecting cable-motor Cable m, 2x.75mm 2 -auxiliary switch Cable m, 6x.75mm 2 nominal voltage Position accuracy ±5% Direction of rotation Selectable by mounting L/R Manual override With hand crank and interlocking switch Max. 95º, can be limited with adjustable mechanical end stops Running time -motor -spring return 6s C / max. 3 C Sound power level -motor -spring return Mode of operation Max. 55dB(A) Max. 7dB(A) Mechanical III (safety extra-low voltage) CE according to 24/8/EC Type.AA.B (EN673-) C -free 4.5kg Damper spindle Length >2 < >2 < mm mm mm mm V Subject to modification

47 Mechanical Fail-Safe Damper Actuator EFU24-SR Mechanical Fail-Safe Actuator with emergency function for adjusting air dampers in ventilation and air conditioning systems in buildings. : : Control signal: Position feedback signal: 3Nm AC/DC 24V DC ()2...V DC 2...V AC 24V 5/6Hz, DC 24V range AC V / DC V nominal torque / holding For transformer sizing 2VA Connecting cable Cable m, 4x.75mm 2 nominal voltage Control signal Y DC input impedance kω Position feedback signal U DC max..5ma Position accuracy ±5% Direction of rotation Reversible with switch / selectable by mounting L / R Manual override With hand crank and interlocking switch Max. 95º, can be limited with adjustable mechanical end stops Running time -motor -spring return 5s C / max. 3 C Sound power level -motor -spring return Mode of operation Max. 5s running time Max. 7dB(A) Mechanical III (safety extra-low voltage) CE according to 24/8/EC Type.AA (EN673-) C -free 4.3kg Damper spindle Length >2 < >2 < V Subject to modification mm mm mm mm

48 Mechanical Fail-Safe Damper Actuator EFU23-S2 Mechanical Fail-Safe Actuator with emergency function for adjusting air dampers in ventilation and air conditioning systems in buildings. : : Control: 2xSPDT auxiliary switches 3Nm AC 23V Open/Close AC 23V 5/6Hz range AC V nominal torque / holding For transformer sizing 22VA Auxiliary switch (-S2) 2xSPDT, ma...3(.5)a, AC 25V one fixed at %, one adjustable...9% Connecting cable -motor Cable m, 2x.75mm 2 -auxiliary switch Cable m, 6x.75mm 2 nominal voltage Position accuracy ±5% Direction of rotation Selectable by mounting L/R Manual override With hand crank and interlocking switch Max. 95º, can be limited with adjustable mechanical end stops Running time -motor -spring return 6s C / max. 3 C Sound power level -motor -spring return Low voltage directive Mode of operation Max. 55dB(A) Max. 7dB(A) Mechanical II (Totally insulated) CE according to 24/8/EC CE according to 26/95/EC Type.AA.B (EN673-) C -free 4.5kg Damper spindle Length >2 < >2 < mm mm mm mm V Subject to modification